EP 1003657 A1 20000531 - ABS MODULATOR SOLENOID WITH A PRESSURE BALANCING PISTON
Title (en)
ABS MODULATOR SOLENOID WITH A PRESSURE BALANCING PISTON
Title (de)
ELEKTROMAGNETVENTIL MIT DRUCKAUSGLEICHSKOLBEN FÜR EINEN ABS-MODULATOR
Title (fr)
SOLENOIDE DE MODULATEUR ABS AVEC PISTON D'EQUILIBRAGE DE PRESSION
Publication
Application
Priority
- US 9817348 W 19980821
- US 91707397 A 19970822
Abstract (en)
[origin: WO9910213A1] An ABS modulator solenoid valve (10), having one electric solenoid (12), in which the valve control piston (14) has a passage (16) therethrough for balancing the pneumatic pressure on both ends (34, 36) of the control piston (14). One end (34) of the piston (14) is disposed in a closed piston chamber (32) while the other end (36) is positioned to contact and position a valve spool (40). The passage (16) extends between the ends (34, 36) of the piston (14). Piston (14) is biased by a spring (50) to a position within the piston chamber (32). When the solenoid (12) is de-energized, the piston (14) remains in this position and variable air pressure, from an operator controlled brake valve (126), can be supplied through the valve (10) to a brake chamber (128) for operating the vehicle service brakes. During an ABS application, the solenoid (12) is energized to overcome the inlet spring (50) bias and the piston (14) moves into engagement with the valve spool (40). The spool (40) is biased by an exhaust spring (52) to a position wherein the exhaust port (24) is isolated from the supply port (20) and the delivery port (22). When the solenoid (12) is fully energized, the piston (14) engages the spool (40) and moves it to the exhaust position. When the solenoid is energized with a selected hold current, the piston (14) engages but does not move the spool (40) and the valve (10) is then in a hold position. Since the pressure on the ends (34, 36) of the piston (14) is balanced, the force required to move the piston (14) to the hold position is relatively constant and not greatly effected by the pneumatic pressure at the supply port (20) or the delivery port (22).
IPC 1-7
IPC 8 full level
B60T 8/36 (2006.01); B60T 13/68 (2006.01); B60T 15/02 (2006.01); F15B 13/044 (2006.01); F16K 31/06 (2006.01); G03G 15/02 (2006.01)
CPC (source: EP US)
B60T 8/362 (2013.01 - EP US); B60T 8/367 (2013.01 - EP US); B60T 15/027 (2013.01 - EP US); F15B 13/044 (2013.01 - EP US); Y10T 137/86919 (2015.04 - EP US); Y10T 137/87217 (2015.04 - EP US)
Designated contracting state (EPC)
AT BE DE ES FR GB IT NL SE
DOCDB simple family (publication)
WO 9910213 A1 19990304; CA 2300897 A1 19990304; CA 2300897 C 20080415; EP 1003657 A1 20000531; EP 1003657 B1 20050803; JP 2003525790 A 20030902; US 5979503 A 19991109
DOCDB simple family (application)
US 9817348 W 19980821; CA 2300897 A 19980821; EP 98942183 A 19980821; JP 2000507562 A 19980821; US 91707397 A 19970822